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Differences What are the advantages of each

Front view of GeForce GTS 250M

Reasons to consider the
Nvidia GeForce GTS 250M

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Higher effective memory clock speed 3,200 MHz vs 1,800 MHz Around 80% higher effective memory clock speed
Higher memory bandwidth 51.2 GB/s vs 14.4 GB/s More than 3.5x higher memory bandwidth
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce 920M

Reasons to consider the
Nvidia GeForce 920M

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Much higher clock speed 954 MHz vs 500 MHz More than 90% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 732.7 GFLOPS vs 240 GFLOPS More than 3x better floating-point performance
More shading units 384 vs 96 288 more shading units
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed

Benchmarks Real world tests of GeForce GTS 250M vs 920M

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 920M
3,362.52

Features Key features of the GeForce GTS 250M  vs 920M 

memory bandwidth Rate at which data can be read from or stored in onboard memory

GeForce GTS 250M
51.2 GB/s
GeForce 920M
14.4 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

GeForce GTS 250M
10 GPixel/s
GeForce 920M
7.63 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

GeForce GTS 250M
40 GTexel/s
GeForce 920M
30.53 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTS 250M
240 GFLOPS
GeForce 920M
732.7 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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